Description of the problem: the preparation of an application calculating the trapezoidal area.
问题描述：编写一个应用程序计算梯形的面积。
The calculating formula for flow area is giving by application of basic theory.
应用基础理论推导出通流面积的计算公式，并举例说明其计算方法。
Finally a calculating method for air supply in mining area by dilution equation was proposed.
最后给出了运用稀释方程计算采场供风量的方法。
Finally a calculating method for air supply in mining area by dilution equation was proposed.
最后给出了运用稀释方程计算采场供风量的方法。
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